Can’ t implement Firebase authentification via thymeleaf template

I have version of similar Firebase authentification and it’s work just fine. but the second (below) doesn’t work at all.
Tamplete “login” uses spring security whith login page configured to (.loginPage(“/login”)) so i think it’s because of spring security. i’ve tryed to delete first part of html template but it has no effect.

    @GetMapping("/login")
    public String showLoginPage(Model model) {
        return "login"; // Возвращает имя представления login.html или login.jsp
    }

    @GetMapping("/get-token")
    @ResponseBody
    public String getToken1() {
        try {
        serviceAccount = new FileInputStream("./my-aws-6e0f8-firebase-adminsdk-q06q0-78540b7e56.json");
        } catch (Exception e) {     
        System.out.println("no key");
        }
        try {
        options = new FirebaseOptions.Builder()
                .setCredentials(GoogleCredentials.fromStream(serviceAccount))
                .build();
        } catch (Exception e) {
        System.out.println("options error");    
        }
        FirebaseApp.initializeApp(options);
        try {
        customToken = FirebaseAuth.getInstance().createCustomTokenAsync(UID).get();
        } catch (Exception e) {
            System.out.println("get token error");
        }
        System.out.println(customToken);

        return customToken;
    }



<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Login</title>
    <div style="text-align: right;">
  <a href="/">На главную страницу</a>
</div>
  <script type="module" src="https://www.gstatic.com/firebasejs/10.3.0/firebase-app.js"></script>
  <script type="module" src="https://www.gstatic.com/firebasejs/10.3.0/firebase-analytics.js"></script>
  <script type="module" src="https://www.gstatic.com/firebasejs/10.3.0/firebase-auth.js"></script>
</head>
<body>
<h1>Login Page</h1>
    <p th:if="${param.resetSuccess}">Your password has been reset successfully!</p>
    <p th:if="${param.passwordReset}">Your password has been changed successfully!</p>
    <!-- Остальной код страницы логина -->
<div style="text-align: right;">
    <span th:if="${#httpServletRequest.userPrincipal != null}">
        Пользователь: <span th:text="${#httpServletRequest.userPrincipal.name}"></span>
        <form th:action="@{/logout}" method="post">
            <input type="submit" value="Выйти"/>
        </form>
    </span>
</div>
<form th:action="@{/login}" method="POST">
    <label for="username">Username:</label>
    <input type="text" id="username" name="username" required><br><br>

    <label for="password">Password:</label>
    <input type="password" id="password" name="password" required><br><br>

   <button type="submit">Login</button>
</form>

<br>

<a href="/register"><button>Register</button></a> <br> <br>
<a href="/forgot-password"><button>Забыли пароль?</button></a> <br> <br>
<!-- Сообщение об ошибке -->
<div th:if="${param.error}">
    <p style="color: red;">Пользователь не найден</p>
</div>


<script type="module">
      import { initializeApp } from 'https://www.gstatic.com/firebasejs/10.3.0/firebase-app.js';
      import { getAnalytics } from 'https://www.gstatic.com/firebasejs/10.3.0/firebase-analytics.js';
      import { getAuth, signInWithCustomToken} from 'https://www.gstatic.com/firebasejs/10.3.0/firebase-auth.js';

const firebaseConfig = {
  apiKey: "AIzaSyCC7XORgSSdu4gq4OGZQ4G0XKAgy7K5STM",
  authDomain: "my-aws-6e0f8.firebaseapp.com",
  projectId: "my-aws-6e0f8",
  storageBucket: "my-aws-6e0f8.appspot.com",
  messagingSenderId: "567282066781",
  appId: "1:567282066781:web:52a68db33898707420b4b4",
  measurementId: "G-8VML47T1BF"
};

  // Initialize Firebase
  const app = initializeApp(firebaseConfig);
  const analytics = getAnalytics(app);
    // Получение токена с помощью Fetch API
    fetch('/get-token')
      .then(response => response.text())
      .then(tokenFromServer => {
        document.getElementById('token').textContent = tokenFromServer;

        const auth = getAuth(app);
        signInWithCustomToken(auth, tokenFromServer)
          .then((userCredential) => {
            // Пользователь успешно вошел
            const user = userCredential.user;
            // ...
          })
          .catch((error) => {
            // Обработка ошибки при входе пользователя
            const errorCode = error.code;
            const errorMessage = error.message;
            // ...
          });
      })
      .catch(error => console.log(error));
  </script>
</body>
</html>